Engineering Materials MCQs

Yes

No

heated from 30° C to 50° C above the upper critical temperature and then cooled in still air

heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace

heated below or close

boron steel

high speed steel

stainless steel

malleable cast iron

13% carbon and 87% ferrite

13% cementite and 87% ferrite

13% ferrite and 87% cementite

6.67% carbon and 93.33

line defect

surface defect

point defect

none of these

Vacancy

Interstitial imperfection

Frenkel imperfection

all of these

sulphur

phosphorus

manganese

silicon

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

3.5 to 4.5% copper, 1.2 to 1.7% managanese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium

4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

5 to 6% tin, 2 to 3% c

mainly ferrite

mainly pearlite

ferrite and pearlite

pearlite and cementite

α-iron

β-iron

γ-iron

δ-iron